A-Z=35=>Z=A-35
N=35
Z+A=93=>A-35+A=93=>2A=128=>A=64
M=64, Cu
a) Cu, Z=29, 1s2/2s22p6/3s23p63d10/4s1
b) MCuSO4=160g/mol
n=m/M=9,6/160=0,06 moli CuSO4
2Al + 3CuSO4 => Al2(SO4)3 + 3Cu
2*27g Al................3 moli CuSO4
x g Al....................0,06 moli CuSO4
x=54*0,06/3=